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CPU is suddenly always running at 90-100%

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Hello guys, for the past few days I've been experiencing this problem...CPU will suddenly run at 100% even though there is no running application to make it that high. After looking at the Task Manager, it shows that it was the SERVICE HOST: LOCAL SERVICE
(No Impersonation), before it was (7), now its (5). After looking at the internet for solution, somebody says that it is a windows maintenance, and I just have to wait for it to finish and He's right..But it does comes back again and again everyday.

What I discover is that when I change my laptop's power option from Balance to Power Saver, it does sometimes cause it to cool down sometimes not. I always set my laptop at Balance, when going afk I turn it to Power Saver.